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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbbd733f520bb41e1be602d2639a2f06fc66285c32e9b587d5166b71b29de4b' 
  AND token = 'RrXWNZvi6/9t4uI2HLVPmw2K29B9ASmTSLy7RDYS1WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}